Couture has the perfect style to neutralize Fedor if he could avoid the KO. Dirty boxing in the clinch, good wrestler and good sub defense. It'd be tough for Fedor to sub Randy from the bottom but he (FE) always had great sweeps.
Are we jus sticking with fighters relevant during Fedor's run in PRIDE or any fighter? If its anyone, I'd list:
Cain
Overeem
Jon Jones
JDS
Stipe
And a catchweight fight near 205 with Anderson.
I think Fedor beats JDS and Stipe, prob decisions Randy but I'd favor HW Overeem and Cain over him. I'd also take Jones over him, Jones could bulk up to be as big and wouldnhavbe a great reach advantage and could take Fedor down to unleash his Hellbows.